Photophysical properties of tyrosine at low pH range

Autor:	Mariusz Szabelski, Hanna Sulowska, Alicja Rzeska, Jerzy Karolczak, Katarzyna Guzow, Wiesław Wiczk
Rok vydání:	2002
Předmět:	Quenching (fluorescence) Chemistry Excited state General Physics and Astronomy Quantum yield Protonation Emission spectrum Physical and Theoretical Chemistry Tyrosine Photochemistry Fluorescence Ion
Zdroj:	Chemical Physics Letters. 362:519-526
ISSN:	0009-2614
DOI:	10.1016/s0009-2614(02)01135-1
Popis:	The global analysis of the fluorescence intensity decays of tyrosine across the emission spectrum at pH=0 revealed that its fluorescence intensity decay is bi-exponential with fluorescence lifetimes equal to 63±7 ps and 1.030±0.009 ns, whereas, the global analysis of the fluorescence intensity decays of tyrosine at different pH revealed that the quenching of tyrosine fluorescence by H 3 O + ions is connected with the presence of protonated carboxyl group. The lack of acid–base equilibrium in the excited state or disturbance of this equilibrium by an additional quenching process caused the discrepancy between experimental points and Hendersson–Haselbalch relationship.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7aee7c5bc45cbb3efd24ee594dc7d64e https://doi.org/10.1016/s0009-2614(02)01135-1 Zobrazit plný text záznamu Full Text from ScienceDirect